CVE-2026-5545

libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTPS request after a Negotiate-authenticated one, when both use the same host. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid...

CVE-2026-5545

libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTPS request after a Negotiate-authenticated one, when both use the same host. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid...

CVE-2026-5545 wrong reuse of HTTP Negotiate connection

libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTPS request after a Negotiate-authenticated one, when both use the same host. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid...

CVE-2026-5545 wrong reuse of HTTP Negotiate connection

libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTPS request after a Negotiate-authenticated one, when both use the same host. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid...

CVE-2026-5545 wrong reuse of HTTP Negotiate connection

libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTPS request after a Negotiate-authenticated one, when both use the same host. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid...

CVE-2026-5545: Authentication Bypass by Primary Weakness

libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTPS request after a Negotiate-authenticated one, when both use the same host. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid...

libcurl 安全漏洞

libcurl is a free and easy-to-use client URL transfer library for cURL, which is open-source. There is a security vulnerability in libcurl, caused by improper handling of custom Host headers. This vulnerability may lead to the incorrect transmission of cookies from the first request during the...

CVE-2026-6276: Origin Validation Error

Using libcurl, when a custom Host: header is first set for an HTTP request and a second request is subsequently done using the same easy handle but without the custom Host: header set, the second request would use stale information and pass on cookies meant for the first host in the second reques...

CVE-2026-7168: Authentication Bypass by Capture-replay

Successfully using libcurl to do a transfer over a specific HTTP proxy proxyA with Digest authentication and then changing the proxy host to a second one proxyB for a second transfer, reusing the same handle, makes libcurl wrongly pass on the Proxy-Authorization: header field meant for proxyA, to...

CVE-2026-5773: Exposure of Data Element to Wrong Session

libcurl might in some circumstances reuse the wrong connection for SMBS transfers. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the...

libcurl 代码问题漏洞

libcurl is an open-source, free, and easy-to-use client URL transfer library for cURL. There are code vulnerabilities in libcurl, stemming from errors in connection reuse logic. These vulnerabilities may cause SMB transfers to incorrectly reuse existing connections to different shares, resulting ...

libcurl 代码问题漏洞

libcurl is an open-source, free, and easy-to-use client URL transfer library for cURL. There are code vulnerabilities in libcurl, stemming from a logical error in connection reuse logic. This error may lead to the incorrect reuse of connections that use different credentials after Negotiate...

CVE-2026-6429: Exposure of Sensitive Information to an Unauthorized Actor

When asked to both use a .netrc file for credentials and to follow HTTP redirects, libcurl could leak the password used for the first host to the followed-to host under certain circumstances...

Unity Linux 20.1060e / 20.1070e Security Update: curl (UTSA-2026-017594)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-017594 advisory. libcurl-using applications can ask for a specific client certificate to be used in a transfer. This is done with the CURLOPTSSLCERT option --cert with the command li...

JLSEC-2026-434 Due to a mistake in libcurl's WebSocket code, a malicious server can send a particularly crafted...

Due to a mistake in libcurl's WebSocket code, a malicious server can send a particularly crafted packet which makes libcurl get trapped in an endless busy-loop. There is no other way for the application to escape or exit this loop other than killing the thread/process. This might be used to DoS...

JLSEC-2026-426 When using `CURLOPT_PINNEDPUBLICKEY` option with libcurl or `--pinnedpubkey` with the curl tool,curl...

When using CURLOPTPINNEDPUBLICKEY option with libcurl or --pinnedpubkey with the curl tool,curl should check the public key of the server certificate to verify the peer. This check was skipped in a certain condition that would then make curl allow the connection without performing the proper chec...

JLSEC-2026-416 When an application tells libcurl it wants to allow HTTP/2 server push, and the amount of received...

When an application tells libcurl it wants to allow HTTP/2 server push, and the amount of received headers for the push surpasses the maximum allowed limit 1000, libcurl aborts the server push. When aborting, libcurl inadvertently does not free all the previously allocated headers and instead lea...

JLSEC-2026-432 libcurl accidentally skips the certificate verification for QUIC connections when connecting to a...

libcurl accidentally skips the certificate verification for QUIC connections when connecting to a host specified as an IP address in the URL. Therefore, it does not detect impostors or man-in-the-middle attacks...

JLSEC-2026-396

When doing HTTPS transfers, libcurl might erroneously use the read callback CURLOPTREADFUNCTION to ask for data to send, even when the CURLOPTPOSTFIELDS option has been set, if the same handle previously was used to issue a PUT request which used that callback. This flaw may surprise the...

JLSEC-2026-421 libcurl would wrongly close the same eventfd file descriptor twice when taking down a connection...

libcurl would wrongly close the same eventfd file descriptor twice when taking down a connection channel after having completed a threaded name resolve...